1 | /* |
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2 | * NOTE: The structure of the routines is identical to that of POSIX |
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3 | * Message_queues to leave the option of having unnamed message |
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4 | * queues at a future date. They are currently not part of the |
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5 | * POSIX standard but unnamed message_queues are. This is also |
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6 | * the reason for the apparently unnecessary tracking of |
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7 | * the process_shared attribute. [In addition to the fact that |
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8 | * it would be trivial to add pshared to the mq_attr structure |
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9 | * and have process private message queues.] |
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10 | * |
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11 | * This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open |
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12 | * time. |
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13 | * |
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14 | * $Id$ |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <stdarg.h> |
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22 | |
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23 | #include <pthread.h> |
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24 | #include <limits.h> |
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25 | #include <errno.h> |
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26 | #include <fcntl.h> |
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27 | #include <mqueue.h> |
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28 | |
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29 | #include <rtems/system.h> |
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30 | #include <rtems/score/watchdog.h> |
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31 | #include <rtems/seterr.h> |
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32 | #include <rtems/posix/mqueue.h> |
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33 | #include <rtems/posix/time.h> |
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34 | |
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35 | /*PAGE |
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36 | * |
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37 | * _POSIX_Message_queue_Receive_support |
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38 | * |
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39 | * NOTE: XXX Document how size, priority, length, and the buffer go |
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40 | * through the layers. |
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41 | */ |
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42 | |
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43 | ssize_t _POSIX_Message_queue_Receive_support( |
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44 | mqd_t mqdes, |
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45 | char *msg_ptr, |
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46 | size_t msg_len, |
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47 | unsigned int *msg_prio, |
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48 | Watchdog_Interval timeout |
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49 | ) |
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50 | { |
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51 | POSIX_Message_queue_Control *the_mq; |
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52 | POSIX_Message_queue_Control_fd *the_mq_fd; |
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53 | Objects_Locations location; |
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54 | uint32_t length_out; |
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55 | |
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56 | the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location ); |
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57 | switch ( location ) { |
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58 | case OBJECTS_ERROR: |
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59 | rtems_set_errno_and_return_minus_one( EBADF ); |
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60 | case OBJECTS_REMOTE: |
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61 | _Thread_Dispatch(); |
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62 | return POSIX_MP_NOT_IMPLEMENTED(); |
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63 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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64 | case OBJECTS_LOCAL: |
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65 | if ( (the_mq_fd->oflag & O_ACCMODE) == O_WRONLY ) { |
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66 | _Thread_Enable_dispatch(); |
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67 | rtems_set_errno_and_return_minus_one( EBADF ); |
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68 | } |
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69 | |
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70 | the_mq = the_mq_fd->Queue; |
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71 | |
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72 | if ( msg_len < the_mq->Message_queue.maximum_message_size ) { |
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73 | _Thread_Enable_dispatch(); |
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74 | rtems_set_errno_and_return_minus_one( EMSGSIZE ); |
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75 | } |
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76 | |
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77 | /* |
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78 | * Now if something goes wrong, we return a "length" of -1 |
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79 | * to indicate an error. |
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80 | */ |
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81 | |
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82 | length_out = -1; |
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83 | |
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84 | _CORE_message_queue_Seize( |
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85 | &the_mq->Message_queue, |
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86 | mqdes, |
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87 | msg_ptr, |
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88 | &length_out, |
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89 | (the_mq_fd->oflag & O_NONBLOCK) ? FALSE : TRUE, |
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90 | timeout |
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91 | ); |
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92 | |
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93 | _Thread_Enable_dispatch(); |
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94 | *msg_prio = |
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95 | _POSIX_Message_queue_Priority_from_core(_Thread_Executing->Wait.count); |
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96 | |
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97 | if ( !_Thread_Executing->Wait.return_code ) |
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98 | return length_out; |
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99 | |
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100 | rtems_set_errno_and_return_minus_one( |
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101 | _POSIX_Message_queue_Translate_core_message_queue_return_code( |
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102 | _Thread_Executing->Wait.return_code |
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103 | ) |
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104 | ); |
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105 | } |
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106 | return POSIX_BOTTOM_REACHED(); |
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107 | } |
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